2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/218086A Hamiltonian for a one-dimensional (1-D) dissipative system is given which shows that the trajectories in the spaces ($x,\dot x$) and ($x,p$) are completely different. The trajectory in the space ($x,p$) has an unexpected contra-intuitive behavior, and a canonical transformation does not solve this behavior.6 pages, no figuresClassical Physicstext